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    SubjectRe: [PATCH] trim memory not covered by WB MTRRs


    On Wed, 6 Jun 2007, Randy Dunlap wrote:

    > On Wed, 6 Jun 2007 15:28:43 -0700 Jesse Barnes wrote:
    >
    >> On Wednesday, June 6, 2007 3:26 pm Justin Piszcz wrote:
    >>> Nope, I booted with only netconsole= options. I have a lot of HW in
    >>> the box and I guess the buffer is too small. Not sure where to
    >>> change it in the kernel. Looking..
    >>
    >> It's called "kernel log buffer size" and it's in "General setup".
    >
    > or you can just boot with "log_buf_len=256k" on the kernel boot line (e.g.)
    >
    > ---
    > ~Randy
    > *** Remember to use Documentation/SubmitChecklist when testing your code ***
    >

    Thanks, very useful note!

    $ stress --vm 32 --vm-bytes 250M
    stress: info: [4087] dispatching hogs: 0 cpu, 0 io, 32 vm, 0 hdd

    Mem: 8039576k total, 5288036k used, 2751540k free, 12k buffers
    Swap: 0k total, 0k used, 0k free, 37944k cached


    $ stress --vm 40 --vm-bytes 250M
    stress: info: [4120] dispatching hogs: 0 cpu, 0 io, 40 vm, 0 hdd
    Mem: 8039576k total, 6661484k used, 1378092k free, 12k buffers
    Swap: 0k total, 0k used, 0k free, 38000k cached

    $ stress --vm 42 --vm-bytes 250M
    stress: info: [4398] dispatching hogs: 0 cpu, 0 io, 42 vm, 0 hdd
    Mem: 8039576k total, 6447048k used, 1592528k free, 8k buffers
    Swap: 0k total, 0k used, 0k free, 11148k cached

    $ stress --vm 45 --vm-bytes 250M
    stress: info: [4352] dispatching hogs: 0 cpu, 0 io, 45 vm, 0 hdd
    stress: FAIL: [4372] (494) hogvm malloc failed: Cannot allocate memory
    stress: FAIL: [4352] (395) <-- worker 4372 returned error 1
    stress: WARN: [4352] (397) now reaping child worker processes
    stress: FAIL: [4352] (452) failed run completed in 4s

    $ stress --vm 48 --vm-bytes 250M
    stress: info: [4303] dispatching hogs: 0 cpu, 0 io, 48 vm, 0 hdd
    stress: FAIL: [4323] (494) hogvm malloc failed: Cannot allocate memory
    stress: FAIL: [4322] (494) hogvm malloc failed: Cannot allocate memory
    stress: FAIL: [4303] (395) <-- worker 4323 returned error 1
    stress: WARN: [4303] (397) now reaping child worker processes
    stress: FAIL: [4303] (395) <-- worker 4322 returned error 1
    stress: WARN: [4303] (397) now reaping child worker processes
    stress: FAIL: [4303] (452) failed run completed in 4s

    Is there a better way to verify I can use all the available memory?

    Justin.
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